CN110535795B - Signal processing method and device - Google Patents
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- CN110535795B CN110535795B CN201810509876.7A CN201810509876A CN110535795B CN 110535795 B CN110535795 B CN 110535795B CN 201810509876 A CN201810509876 A CN 201810509876A CN 110535795 B CN110535795 B CN 110535795B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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Abstract
The embodiment of the invention discloses a signal processing method and a signal processing device, wherein the signal processing method comprises the following steps: when the adjusted power point of the AGC module is in a useful part of the OFDM symbol, multiplying the signal of the first part by a coefficient; converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain; wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient. In the embodiment of the invention, the signal of the first part is multiplied by the coefficient, so that the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient, namely, the signal of the first part is converted into a frequency domain after being compensated, and the interference between carriers is eliminated to a great extent.
Description
Technical Field
Embodiments of the present invention relate to communications technologies, and in particular, to a method and an apparatus for processing a signal.
Background
Orthogonal Frequency Division Multiplexing (OFDM) systems are commonly used communication systems. Automatic Gain Control (AGC) modules are widely used in OFDM systems to compensate for fluctuations in received signal power so that quantization errors caused by Analog to Digital converters (ADCs) are minimized. Generally, AGC requires a settling time to adjust the received signal power.
The length of the cyclic prefix in the OFDM symbol is generally the same as the length of the channel delay, and when signals of other users pass through a multipath channel, the cyclic prefix of the first OFDM symbol of the target user contains the signal power of the other users. Since the cyclic prefix containing the signal power of other users cannot be used for AGC power measurement, if the part of the cyclic prefix of the first OFDM symbol not containing the signal power of other users is less than the settling time of AGC, the AGC module is caused to adjust in the useful part of the OFDM symbol, which destroys the orthogonality between carriers and thus generates the inter-carrier interference.
Disclosure of Invention
The embodiment of the invention provides a signal processing method and a signal processing device, which can eliminate inter-carrier interference.
The embodiment of the invention provides a signal processing method, which comprises the following steps:
when the adjusting power point of the automatic gain control module is in the useful part of the orthogonal frequency division multiplexing symbol, multiplying the signal of the first part by a coefficient;
converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain;
wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient.
In this embodiment of the present invention, when the power adjustment point of the automatic gain control module is at the cyclic prefix of the ofdm symbol, the method further includes:
converting the signal of the useful part of the orthogonal frequency division multiplexing symbol to the frequency domain.
In an embodiment of the present invention, before multiplying the signal of the first part by the coefficient, the method further includes: the signal of the useful part is converted into a digital signal by an analog-to-digital converter.
In an embodiment of the present invention, the converting the signal of the useful part into a digital signal by an analog-to-digital converter includes:
the signal of the first part is converted into a digital signal by the analog-to-digital converter: q (y)j)＝sfyj+dj；
The second part of the signal is converted into a digital signal by the analog-to-digital converter: q (y)j)＝as0yj+dj；
Wherein, yjThe j (th) signal of the useful part, Q (y)j) For the j-th of said digital signal of said useful part, djIs yjA is a power adjustment factor, sfIs a scaling factor, s, of the signal of the first part0Is a scaling factor of the signal of the second part.
In the embodiment of the present invention, the coefficient is calculated according to the following formula:
where c is the coefficient, a is the power adjustment factor, sfIs a scaling factor, s, of the signal of the first part0Is a scaling factor of the signal of the second part.
In an embodiment of the invention, at least one of the following is included:
according to the formula
Calculating a scaling factor for the signal of the first portion;
according to the formula
Calculating a scaling factor for the signal of the second portion;
wherein the content of the first and second substances,
g is the average power of the signal of the useful part, R is the number of intervals after quantization of the analog-to-digital converter, erfc is the error complementation function.
An embodiment of the present invention provides a signal processing apparatus, including:
a processing module for multiplying the signal of the first part by a coefficient when the adjusted power point of the automatic gain control module is in a useful part of the orthogonal frequency division multiplexing symbol;
a conversion module for converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain;
wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient.
An embodiment of the present invention provides a signal processing apparatus, including a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, any one of the signal processing methods is implemented.
An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any one of the signal processing methods described above.
The embodiment of the invention comprises the following steps: when the adjusted power point of the AGC module is in a useful part of the OFDM symbol, multiplying the signal of the first part by a coefficient; converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain; wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient. In the embodiment of the invention, the signal of the first part is multiplied by the coefficient, so that the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient, namely, the signal of the first part is converted into a frequency domain after being compensated, and the interference between carriers is eliminated to a great extent.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the examples of the invention serve to explain the principles of the embodiments of the invention and not to limit the embodiments of the invention.
Fig. 1 is a flowchart of a signal processing method according to an embodiment of the present invention;
FIG. 2 is a flow chart of an example of a signal processing method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal processing apparatus according to another embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Referring to fig. 1, an embodiment of the present invention provides a signal processing method, including:
and step 100, when the adjusted power point of the AGC module is in the useful part of the OFDM symbol, multiplying the signal of the first part by a coefficient.
In an embodiment of the invention, an OFDM symbol includes a cyclic prefix and a useful portion.
In the embodiment of the present invention, the coefficient is calculated according to the following formula:
where c is the coefficient, a is the power adjustment factor, sfIs a scaling factor, s, of the signal of the first part0Is a scaling factor of the signal of the second part.
Wherein, according to the formula
Calculating a scaling factor for the signal of the first portion;
according to the formula
Calculating a scaling factor for the signal of the second portion;
wherein the content of the first and second substances,
g is the average power of the signal in the useful part, R is the number of intervals after quantization in the analog-to-digital converter, and erfc is the error complementation function.
In the embodiment of the invention, when the signal of the useful part of the OFDM symbol is expressed as y ═ y0，y1，…，yN－1]And the adjusted power point of the AGC module is at yn－1And ynIn between, the useful part of the signal after adjusting the power is denoted as y0，…，yn－1，ayn，…，ayN－1；
The digital signal after ADC conversion is represented as Q: (y0)，...，Q(yn-1)，Q(yn)，...，Q(yN-1)；
Then cQ (y)0)，...，cQ(yn-1)，Q(yn)，...，Q(yN-1) Conversion to the frequency domain.
In another embodiment of the present invention, when the adjusted power point of the AGC module is at the cyclic prefix of the OFDM symbol, the method further comprises:
converting the signal of the useful part of the orthogonal frequency division multiplexing symbol to the frequency domain.
In another embodiment of the present invention, before multiplying the signal of the first part by the coefficient, the method further comprises: the useful part is converted into a digital signal by the ADC. Correspondingly, the first part is the part of the digital signal of the useful part before the power point is adjusted; the second part is the part of the digital signal of the useful part after the power point is adjusted.
In the above embodiments of the present invention, the OFDM symbol refers to an OFDM symbol after power adjustment.
In an embodiment of the present invention, the converting the useful part into the digital signal by the ADC includes:
the signal of the first part is converted into a digital signal by the ADC: q (y)j)＝sfyj+dj，j＝0，…，n－1；
The second part of the signal is converted into a digital signal by the ADC: q (y)j)＝as0yj+dj，j＝n，…，N－1；
Wherein, yjThe j (th) signal of the useful part, Q (y)j) For the j-th of said digital signal of said useful part, djIs yjA is a power adjustment factor, sfIs a scaling factor, s, of the signal of the first part0Is a scaling factor of the signal of the second part.
The above-mentioned precision of converting the useful part into a digital signal is log2(R), i.e. the precision of the ADC block is log2(R)。
In the embodiment of the invention, when the adjusted power point of the AGC module is in the useful part of the OFDM symbol, the condition that the intercarrier interference exists and needs to be eliminated is shown, and the elimination method is to multiply the signal of the first part by a coefficient and then convert the second part and the first part multiplied by the coefficient into a frequency domain.
When the adjusting power point of the AGC module is at the cyclic prefix of the OFDM symbol, no inter-carrier interference exists, and the useful part is directly converted into frequency without eliminating the inter-carrier interference.
Examples of the invention
Referring to fig. 2, the method includes:
Step 202, the AGC module performs power adjustment on the signal of the useful part of the OFDM symbol, the ADC module converts the signal of the useful part after power adjustment into a digital signal, multiplies the signal of the first part by a coefficient, sends the signal of the second part and the signal of the first part multiplied by the coefficient to the FFT module, and the FFT module converts the signal of the second part and the signal of the first part multiplied by the coefficient into a frequency domain.
In this example, the first portion is the portion of the digital signal prior to the adjustment of the power point; the second part is the part of the digital signal after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient.
In this example, when the signal of the useful part of the OFDM symbol is denoted as y ═ y0，y1，…，yN－1]And the adjusted power point of the AGC module is at yn－1And ynIn between, the useful part of the signal after adjusting the power is denoted as y0，…，yn－1，ayn，…，ayN－1(ii) a Wherein, y0，…，yn－1Is the first part, ayn，…，ayN－1Is a second part;
the digital signal after ADC conversion is represented as Q (y)0)，...，Q(yn-1)，Q(yn)，...，Q(yN-1)；
Then cQ (y)0)，...，cQ(yn-1)，Q(yn)，...，Q(yN-1) Conversion to the frequency domain.
Wherein the content of the first and second substances,
referring to fig. 3, another embodiment of the present invention provides a signal processing apparatus, including:
a processing module for multiplying the signal of the first part by a coefficient when the adjusted power point of the automatic gain control module is in a useful part of the orthogonal frequency division multiplexing symbol;
a conversion module for converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain;
wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient.
In another embodiment of the present invention, the conversion module is further configured to:
converting a signal of a useful portion of the orthogonal frequency division multiplexing symbol to a frequency domain when an adjusted power point of the automatic gain control module is at a cyclic prefix of the orthogonal frequency division multiplexing symbol.
In another embodiment of the present invention, the method further comprises:
an ADC module for converting the useful part into a digital signal.
In the embodiment of the present invention, the ADC module is specifically configured to:
the signal of the first part is converted into a digital signal: q (y)j)＝sfyj+dj；
The signal of the second part is converted into a digital signal: q (y)j)＝as0yj+dj；
Wherein, yjThe j (th) signal of the useful part, Q (y)j) For the j-th of said digital signal of said useful part, djIs yjA is a power adjustment factor, sfIs a scaling factor, s, of the signal of the first part0Is a scaling factor of the signal of the second part.
In the embodiment of the present invention, the processing module is specifically configured to calculate the coefficient according to the following formula:
where c is the coefficient, a is the power adjustment factor, sfIs a scaling factor, s, of the signal of the first part0Is a scaling factor of the signal of the second part.
Another embodiment of the present invention provides a signal processing apparatus, including a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the signal processing apparatus implements any one of the signal processing methods described above.
Another embodiment of the present invention proposes a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of any of the signal processing methods described above.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Although the embodiments of the present invention have been described above, the descriptions are only used for understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the invention as defined by the appended claims.
Claims (9)
1. A signal processing method, comprising:
when the adjusting power point of the automatic gain control module is in the useful part of the orthogonal frequency division multiplexing symbol, multiplying the signal of the first part by a coefficient;
converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain;
wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient.
2. The signal processing method of claim 1, wherein when the adjusted power point of the automatic gain control module is at the cyclic prefix of the orthogonal frequency division multiplexing symbol, the method further comprises:
converting the signal of the useful part of the orthogonal frequency division multiplexing symbol to the frequency domain.
3. The signal processing method according to claim 1 or 2, wherein before multiplying the signal of the first portion by a coefficient, the method further comprises: the signal of the useful part is converted into a digital signal by an analog-to-digital converter.
4. The signal processing method of claim 3, wherein converting the useful portion of the signal to a digital signal via an analog-to-digital converter comprises:
the signal of the first part is converted into a digital signal by the analog-to-digital converter:
；
the second part of the signal is converted into a digital signal by the analog-to-digital converter:
；
wherein the content of the first and second substances,
for the j-th signal of the useful part,
for the jth of said digital signals of said useful part,
is composed of
A is a power adjustment factor,
is a scaling factor of the signal of the first part,
is a scaling factor of the signal of the second part.
5. A signal processing method according to claim 1 or 2, characterized in that the coefficients are calculated according to the following formula:
；
wherein c is the coefficient, a is a power adjustment factor,
is a scaling factor of the signal of the first part,
is a scaling factor of the signal of the second part.
6. The signal processing method of claim 5, comprising at least one of:
according to the formula
Calculating a scaling factor for the signal of the first portion;
according to the formula
Calculating a scaling factor for the signal of the second portion;
wherein the content of the first and second substances,
，
，
，
；
g is the average power of the signal of the useful part, and R is the number of intervals after quantization of the analog-to-digital converter.
7. A signal processing apparatus comprising:
a processing module for multiplying the signal of the first part by a coefficient when the adjusted power point of the automatic gain control module is in a useful part of the orthogonal frequency division multiplexing symbol;
a conversion module for converting the second part of the signal and the first part of the signal multiplied by the coefficient into a frequency domain;
wherein the first part is a part of the useful part before the power point is adjusted; the second part is the part of the useful part after the power point is adjusted, and the average power of the signal of the second part is the same as the average power of the signal of the first part multiplied by the coefficient.
8. A signal processing apparatus comprising a processor and a computer-readable storage medium having instructions stored therein, wherein the instructions, when executed by the processor, implement a signal processing method according to any one of claims 1 to 6.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the signal processing method according to any one of claims 1 to 6.
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| WO2019223483A1 (en) | 2019-11-28 |
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